Re: Extensible arrows in ConTeXT

[Mathias Schickel <msch@fa.uni-tuebingen.de>]

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> Am 26.07.2017 um 08:07 schrieb Pablo Rodriguez <oinos@gmx.es>:
> 
> On 07/26/2017 07:20 AM, Mathias Schickel wrote:
>>> Am 26.07.2017 um 00:47 schrieb Hans Hagen:
>>> [...]>> you can patch this in that file and remake the format
>>> 
>>>   elseif kind == e_right then
>>>       local charlist = data[3].horiz_variants
>>>       if charlist then
>>>           local right = charlist[#charlist]
>>>           roffset = abs((right["start"] or 0) - (right["end"] or 0))
>>>       end
>> 
>> Hi Hans,
>> 
>> thank you for your quick answer! I am not sure How I can remake that
>> format. Can you tell me the command for that?
> 
> Hi Matthias,
> 
> as far as I can remember, the command is (I have used it in the past,
> but my memory is weak):
> 
>  context --make --all
> 

Hi Pablo,

thank you for advice! Unfortunately I still get the error

ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:514: attempt to get length of local 'charlist' (a nil value)
stack traceback:
	...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:514: in function 'horizontalcode'
	...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:541: in function <...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:540>
	(...tail calls…)


I see two possible reasons for that:

Either the command „context --make --all“ is not the right one  (besides: How can I check if ConTeXt has remade the format?), or the code is not correctly changed. Maybe you can answer that, Hans.

From line 506 on the code of math-act.lua now is

if kind == e_left then
        local charlist = data[3].horiz_variants
        if charlist then												-- this is the line of the first error as the error code suggests
            local left = charlist[1]
            loffset = abs((left["start"] or 0) - (left["end"] or 0))
        end
    elseif kind == e_right then
       	local charlist = data[3].horiz_variants
       	if charlist then
           	local right = charlist[#charlist]
           	roffset = abs((right["start"] or 0) - (right["end"] or 0))
       	end
     elseif kind == e_horizontal then
        local charlist = data[3].horiz_variants
        if charlist then
            local left = charlist[1]
            local right = charlist[#charlist]
            loffset = abs((left ["start"] or 0) - (left ["end"] or 0))
            roffset = abs((right["start"] or 0) - (right["end"] or 0))
        end
    end
    return kind, loffset, roffset

Is that correct now?

In every case the error code mentioned another line of the same file:

math-act.lua:541: in function <...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:540>
	(...tail calls…)

>> And can you maybe patch that in the distribution, too? (Else I fear
>> that I have to remake that format every time I will update the
>> distribution from contextgarden.)
> As far as I can tell, Hans will fix ConTeXt (he has done in the past).
> But he has provided the patch, so that you may  work until the next beta
> update.

Okay, that is very good!

> 
> Cheers,
> 
> Pablo


Best
Mathias


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
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